From 02d3a57d6466363b316b60ffbba414a4a2cb90c5 Mon Sep 17 00:00:00 2001

From: Juergen Gross <jgross@suse.com>

Date: Thu, 25 Nov 2021 13:38:29 +0100

Subject: [PATCH] SUPPORT.md: limit support statement for Linux and Windows

 frontends

Change the support state of Linux and Windows pv frontends from

"supported" to "supported with caveats" in order to reflect that the

frontends can probably be harmed by their respective backends.

Some of the Linux frontends have been hardened already.

This is XSA-376

Signed-off-by: Juergen Gross <jgross@suse.com>

---

 SUPPORT.md | 57 +++++++++++++++++++++++++++++++++++++++++++++---------

 1 file changed, 48 insertions(+), 9 deletions(-)

diff --git a/SUPPORT.md b/SUPPORT.md

index 3a34933c89..6e3e305b01 100644

--- a/SUPPORT.md

+++ b/SUPPORT.md

@@ -411,7 +411,11 @@ Guest-side driver capable of speaking the Xen PV block protocol

     Status, FreeBSD: Supported, Security support external

     Status, NetBSD: Supported, Security support external

     Status, OpenBSD: Supported, Security support external

-    Status, Windows: Supported

+    Status, Windows: Supported, with caveats

+

+Windows frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### Netfront

@@ -421,20 +425,32 @@ Guest-side driver capable of speaking the Xen PV networking protocol

     Status, FreeBSD: Supported, Security support external

     Status, NetBSD: Supported, Security support external

     Status, OpenBSD: Supported, Security support external

-    Status, Windows: Supported

+    Status, Windows: Supported, with caveats

+

+Windows frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV Framebuffer (frontend)

 Guest-side driver capable of speaking the Xen PV Framebuffer protocol

-    Status, Linux (xen-fbfront): Supported

+    Status, Linux (xen-fbfront): Supported, with caveats

+

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV display (frontend)

 Guest-side driver capable of speaking the Xen PV display protocol

-    Status, Linux: Supported (outside of "backend allocation" mode)

-    Status, Linux: Experimental (in "backend allocation" mode)

+    Status, Linux, outside of "backend allocation" mode: Supported, with caveats

+    Status, Linux, "backend allocation" mode: Experimental

+

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV Console (frontend)

@@ -443,7 +459,11 @@ Guest-side driver capable of speaking the Xen PV console protocol

     Status, Linux (hvc_xen): Supported

     Status, FreeBSD: Supported, Security support external

     Status, NetBSD: Supported, Security support external

-    Status, Windows: Supported

+    Status, Windows: Supported, with caveats

+

+Windows frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV keyboard (frontend)

@@ -451,11 +471,19 @@ Guest-side driver capable of speaking the Xen PV keyboard protocol.

 Note that the "keyboard protocol" includes mouse / pointer /

 multi-touch support as well.

-    Status, Linux (xen-kbdfront): Supported

+    Status, Linux (xen-kbdfront): Supported, with caveats

+

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV USB (frontend)

-    Status, Linux: Supported

+    Status, Linux: Supported, with caveats

+

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ### PV SCSI protocol (frontend)

@@ -464,6 +492,10 @@ multi-touch support as well.

 NB that while the PV SCSI frontend is in Linux and tested regularly,

 there is currently no xl support.

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

+

 ### PV TPM (frontend)

 Guest-side driver capable of speaking the Xen PV TPM protocol

@@ -486,7 +518,11 @@ Guest-side driver capable of making pv system calls

 Guest-side driver capable of speaking the Xen PV sound protocol

-    Status, Linux: Supported

+    Status, Linux: Supported, with caveats

+

+Linux frontend currently trusts the backend;

+bugs in the frontend which allow backend to cause mischief will not be

+considered security vulnerabilities.

 ## Virtual device support, host side

@@ -987,6 +1023,9 @@ are given the following labels:

     This feature is security supported

     by a different organization (not the XenProject).

+    The extent of support is defined by that organization.

+    It might be limited, e.g. like described in **Supported, with caveats**

+    below.

     See **External security support** below.

   * **Supported, with caveats**

-- 

2.26.2